ὀκταέτις

From LSJ

ἀναγκαίως δ' ἔχει βίον θερίζειν ὥστε κάρπιμον στάχυν, καὶ τὸν μὲν εἶναι, τὸν δὲ μή → But it is our inevitable lot to harvest life like a fruitful crop, for one of us to live, one not. (Euripides, Hypsipyle fr. 60.94ff.)

Source

German (Pape)

[Seite 317] ιδος, ἡ, fem. zu ὀκταέτης, Plat. Ep. XIII, 361 d.

Russian (Dvoretsky)

ὀκταέτις: ιδος adj. f восьмилетняя Plat.